CVE-2021-28310 is a high-severity vulnerability affecting Microsoft Win32k, allowing for elevation of privilege. The CVSS score of 7.8 indicates a significant risk, particularly as it can be exploited locally with low complexity and requires minimal privileges. This vulnerability affects various versions of Windows 10 and Windows Server, posing a serious risk to organizations that delay remediation.
Organizations should prioritize patching immediately to mitigate potential exploitation. The vulnerability has been included in the Known Exploited Vulnerabilities (KEV) catalog, emphasizing its active risk profile. The urgency is further underscored by an EPSS score indicating a high likelihood of exploitation.
The vulnerability was disclosed on April 13, 2021, and affects various Windows 10 versions, including 1803, 1809, 1909, 2004, and 20H2, as well as Windows Server versions 1909, 2004, 2019, and 20H2. Organizations must assess their systems and prioritize updating to the latest patches to ensure protection against potential attacks.
In summary, the CVE-2021-28310 vulnerability represents a critical security risk for Microsoft Windows systems, and organizations must act swiftly to apply the necessary updates.
Vulnerability Details
The official CVE description for CVE-2021-28310 states that this vulnerability allows for elevation of privilege in Win32k, a core component of the Windows operating system. It has a CVSS score of 7.8, classified as high severity, indicating a serious risk to affected systems. The vulnerability affects Microsoft Windows 10 versions 1803, 1809, 1909, 2004, 20H2, and Windows Server versions 1909, 2004, 2019, 20H2.
The CWE classification for this vulnerability is CWE-787, indicating an issue with improper access control. The vulnerability was published on April 13, 2021, and has been actively analyzed by security professionals, showcasing its relevance and potential impact.
Technical Analysis
The root cause of CVE-2021-28310 lies in the way Win32k processes certain requests, which may allow an attacker to escalate privileges and gain unauthorized access to system resources. The attack vector is local, meaning the attacker must have access to the system to exploit the vulnerability.
The attack complexity is low, as exploitation does not require specialized conditions or extensive preparation. Privileges required are also low, allowing attackers to leverage this vulnerability without needing administrative access. User interaction is not required, making it easier for an attacker to exploit the vulnerability.
The impacts of this vulnerability are significant, affecting confidentiality, integrity, and availability. If exploited, attackers may gain high-level access to sensitive information and system functionalities, potentially compromising the overall security posture of affected organizations.
Risk & Impact Analysis
The real-world risk associated with CVE-2021-28310 is considerable due to the widespread deployment of the affected Windows versions. Organizations must recognize that an attacker who successfully exploits this vulnerability could gain unauthorized access, leading to data breaches and significant operational disruptions.
The blast radius is extensive, as this vulnerability affects numerous systems within enterprise environments. The urgency for organizations to address this vulnerability is underscored by its classification in the KEV catalog, indicating active exploitation in the wild, which heightens the potential impact on organizations that fail to patch promptly.
Given the CVSS score of 7.8 and the EPSS percentile ranking, organizations must treat this vulnerability as a high priority. Organizations should schedule remediation efforts as part of their ongoing vulnerability management processes.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The affected versions include Microsoft Windows 10 1803, 1809, 1909, 2004, 20H2, and Windows Server versions 1909, 2004, 2019, and 20H2. Organizations should ensure that all systems running these versions are patched to mitigate the risks associated with this vulnerability.
Mitigation & Remediation
To remediate CVE-2021-28310, organizations must apply the security patches provided by Microsoft. The latest updates can be found on the Microsoft Security Update Guide. If patches cannot be applied immediately, organizations should implement strict access controls and monitor systems for unusual activity.
For organizations looking to enhance their security posture, engaging in penetration testing can provide insights into potential vulnerabilities and ensure robust defenses against future exploits.
Detection Guidance
Organizations should monitor logs for indicators of exploitation, such as unusual access patterns or privilege escalations. Behavioral anomalies in user activity may also signal attempts to exploit this vulnerability.
Additionally, implementing network signatures that detect unauthorized access attempts can help organizations respond promptly to potential threats.
AppSecure Threat Intelligence Insight
The significance of CVE-2021-28310 lies in its potential to be exploited in various attack scenarios. This vulnerability highlights the ongoing need for organizations to maintain a proactive security posture, especially with regard to local privilege escalation vulnerabilities.
Security teams should remain vigilant and continuously assess their systems for similar vulnerabilities, learning from the patterns of exploitation and adapting their defenses accordingly.
For further guidance on strengthening your security practices, consider reviewing our penetration testing methodology and adopting a comprehensive approach to vulnerability management.
Additionally, exploring our resources on vulnerability management programs can further enhance your organization's defenses against evolving threats.
As organizations navigate the complexities of modern cybersecurity, leveraging insights from vulnerabilities like CVE-2021-28310 will be critical in shaping effective security strategies.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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